Abstract

The temperature dependence of the electrical conductivity and the field dependence of the magnetoresistivity of samples of multiwall catalyticcarbon nanotubes containing a small amount of amorphouscarbon impurity. Below a temperature of the observed temperature dependence of the conductivity of the nanotubes shows a contribution from two-dimensional quantum corrections to the conductivity. At a temperature of one observes negative magnetoresistance on the curves in the field interval , due to the dominance of the contribution to the magnetoresistance from the quantum corrections for interacting electrons. A special synthesis technique is used to obtain multiwall catalyticcarbon nanotubes that are practically free of amorphouscarbon impurities, making it possible to observe electron–electron interaction effects unnoticeable in previously synthesized nanotubes of this kind.

This study was supported by the Ministry of Education and Science RNP.2,1.1,1604, a grant from the President of the Russian Federation, No. NSh-4419,2006,3, NATO grant SfP 981051, and grant 05-03-32901 from the Russian Foundation for Basic Research.

Article outline:INTRODUCTIONSAMPLES AND MEASUREMENT TECHNIQUESTEMPERATURE DEPENDENCE OF THE CONDUCTIVITYMAGNETORESISTANCECONCLUSION